'T' and its SI unit is Kelvin.
The symbol for dew point temperature is usually represented as Td.
the temperature has changed
The correct symbol for the SI unit of temperature is K (kelvin).
It means the temperature has changed.
Symbol K, for Kelvin. (Do not use 'degree' in conjuction with this)
--> °
A common symbol used to represent temperature is the letter "C" for Celsius or "F" for Fahrenheit. These symbols are commonly used in weather forecasts, cooking recipes, and thermometers to indicate the temperature scale being used.
The symbols for each temperature scale are simply the first letter of each scale, so for degrees Kelvin the symbol is K, for degrees Celcius (or Centigrade) the symbol is C, and for degrees Fahrenheit the symbol is F.
The symbol for an isotherm is a dashed line on a graph that represents a constant temperature measurement.
Insert tab - Symbols section on right side of screen, press arrow on bottom of Symbol and choose temperature symbol, if you can't see it, press More Symbols... at bottom.
The symbol is °C, in which the little circle is 'degrees' just like when measuring angles in degrees. The C is for Celsius.
Silver (symbol Ag) is indeed a solid at room temperature.